Energy efficiency
60.0 J/TH
3,360 W ÷ 56 TH/s
#95 of 99 in the catalog
ASIC miner · MicroBT
MicroBT Whatsminer M21S
An air-cooled Bitcoin ASIC with 56 TH/s at 3,360 W — 60.0 J/TH.
About Whatsminer M21S
The Whatsminer M21S is MicroBT's air-cooled model, released in December 2018. At 60.0 J/TH it ranks #95 of 99 in the catalog by efficiency, and 44th of 48 among air-cooled machines.
At 75 dB and 3.4 kW it needs a data center or a dedicated ventilated room, not a living room.
What the specs add up to
Derived from the specs below, with the formula on every card. Estimates, not a forecast
Electricity used per day
80.6 kWh
3.36 kW × 24 h
29.4 MWh a year
Electricity cost per day
$8.06
80.6 kWh × $0.10 per kWh
Break-even electricity price
$0.021 / kWh
Estimated daily reward ÷ electricity used per day
As of 13 Nov 2026
Built for
Data center
75 dB, 3.36 kW of heat
Home class: up to 50 dB and 1.4 kW, air cooling
Hashrate per kW
16.7 TH/s
56 TH/s ÷ 3.36 kW
Whatsminer M21S or a digital miner with the same 56 TH/s
Same hashrate, side by side. Scenario: you run the machine yourself, on household electricity. Numbers follow our reward calculator and update daily
BTC price · 13 Nov 2026$70,780
Whatsminer M21S
Your own machine · 56 TH/s · 60.0 J/TH
- Upfront cost
- Not shownNot in the catalog yet — see the manufacturer's store
- Reward per day (est.)
- 0.00002 BTC≈ $1.69 at the same hashrate
- Running cost per day
- $8.063.36 kW × 24 h × $0.10 per kWh
- Net per day (est.)
- −$6.38At your electricity price
- Delivery and setup
- Shipping, customs, pool setup
- Noise and heat
- 75 dB and 3.36 kW of heat at your place
GoMining digital miner
56 TH/s · 15 J/TH · runs in our data centers
- Upfront cost
- $65656 TH × $11.71 per TH
- Reward per day (est.)
- 0.00002 BTC≈ $1.69
- Running cost per day
- $1.51Daily maintenance fee: electricity and service
- Net per day (est.)
- $0.18After the maintenance fee
- Delivery and setup
- Nothing to ship — runs in the app
- Noise and heat
- Nothing at your place
Break-even electricity price for this model: $0.021 per kWh. Above it, electricity costs more than the estimated reward
Estimates, not a forecast. Based on the BTC price, network difficulty and GoMining fees as of 13 Nov 2026; specs as published by the manufacturer. Assumes the machine runs 24/7 with no pool fee; industrial hosting is a different calculation. The digital miner's fee is shown before discounts. Mining rewards vary and are not guaranteed; they may fall below fees. Not investment advice. See terms
Whatsminer M21S specifications
16 characteristics, each with its source and the date we checked it. Values are nominal, as published by the manufacturer
- Published spec
- Calculated by GoMining
- Not found
- Manufacturer
- MicroBT
- Model
- Whatsminer M21S
- Algorithm
- SHA-256 (Bitcoin)
- Hashrate variants
- —
- Not found · 16 Oct 2026
- Energy efficiency
- 60.0 J/TH
- Calculated
- Sold by manufacturer
- —
- Not found · 16 Oct 2026
Similar models
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*The bonus miner is subject to vesting and requires a qualifying transaction. Rewards vary and are not guaranteed. See full terms
Frequently Asked Questions
Questions about this model. For everything else, head to the Help Center